Cover of an electronic device with surface pattern



FIG. 1 is a perspective view of a cover of an electronic device with surface pattern showing our new design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a left side elevational view thereof.

In the drawings, the broken lines indicate portions of the cover of an electronic device with surface pattern that form no part of the claimed design. 

The ornamental design for a cover of an electronic device with surface pattern, as shown and described. 